Tool for turning lock-seams upon metal sheets



(No Model.)

v. 0. E. EOKEL. TOOL FOR TURNING LOOK SEAMS UPON METAL SHEETS.

No. 511,764. Patented Jan. 2, 1894.

WITNESS ES: INVENTOR I Char] E5 E.E:/ E]- ATTORN EYS.

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CHARLES E. ECKEL, OF SYRACUSE, NEW YORK.

TOOL FOR TURNING LOCK-SEAMS UPON METAL SHEETS.

SPECIFICATION forming part of Letters Patent No. 511 ,764, dated January 2, 1894.

Application filed August 19,1893. Serial No. 48%589. (No model.)

To aZZ- whom, it may concern.-

Be it known that 1, CHARLES E. EOKEL, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Tools for Turning Lock-Sean1s upon llletal Sheets, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to tools for turning seams upon the edges of metallic sheets.

My object is to produce a seam-turning tool adapted to be used by hand, or power, comprising a handle, a body secured thereto, a gage mounted thereon with a channel between wit and said body, a turner provided with a channel continuous with the gage channel part of one wall thereof sloping outwardly and being also outwardly convex, such convex surface merging into a plane surface, lying at a right angle to said channel, and then by a partial twist creating a concave face which finally merges into a wall parallel to the other wall of said channel and to the mandrel therein, detached from both of said walls and substantially parallel, as to its vertical faces, to said walls; in which the edge of the sheet by the traverse of the tool or of the sheet through the tool, is first gradually bent over until it stands at substantially a right angle to the body thereof, as a flange, and this is next bent gradually over until part of it stands in a plane contiguous and substantially parallel to the body of the sheet and when it passes clear from the mandrel is ready to be hammered down, if desired, or otherwise finished or hooked onto the turned edge of another sheet to connect the two sheets.

My invention consists in the several novel features of construction and operation hereinafter described and which are specifically set forth in the claim hereunto annexed. It is constructed as follows reference being had to the accompanying drawings, in which Figure 1, is a side elevation. Fig. 2, is a like view of the opposite side. Fig. 3, is a bottom plan view. Fig. 4., is a section on line 00 :c, Fig. 1. Fig. 5, is a like View on line y y. Fig. 6, is a like view on line .2 a. Fig. 7, is a front elevation. Fig. 8. is a plan perspective of a strip of sheet metal, showing the upper edge on the left in its normal condition, then showing the turn started, and then gradually developed until at the right the edge is fully turned to form one member of the seam.

A, is a handle to which a T-shaped piece of metal -a is secured, its rear end being bent down as at -a'- and notched in opposite sides to create a T-shaped flange.

l3, isacombined channel and mandrel plate secured to -a by a screw b provided with the vertical notches c-, with the arm c' reduced in thickness at c creating the mandrel d at the rear end.

D, is the combined channel and seam turning plate, secured to -B by the screws eand notched across its upper end, as at e'- to both receive and fit onto the T flange upon a; provided with a parallel sided lower edge h part of the inner wall of which merges with the outwardly beveled and convex seam starter 7L', said converiity rearwardly merging into the plane face h" standing at substantially a right angle to said inner wall, and thence curving downward, said plane face becomes concave as at h until this concavity by a partial twist, finally merges into a plane vertical face, parallel to the inner wall aforesaid, and also parallel to the sides of the mandrel d-.

E, is a gage plate, adj ust'ably secured to the plate B- bythebolts-mpassing through the notches c and consisting of a body provided with arms -nof less thickness, creating between them and the plate -Ba channel 'n which coincides with the channel -n" between the plates -B- and D. The edge of the sheet is placed in this channel and either by forcing the machine along over the edge of the sheet or drawing the edge of the sheet through the machine, is turned, the width turned over being regulated by the gage. The end of the sheet at the edge, first meets the base of the convex inclineh' which starts the bend and turns it down to substantially a right-angled flange at h"- and then encountering thedownwardlycurved concavity h'- this flange is bent down more onto the mandrel, until it becomes fully bent over.

In Fig. 8 the sheet r shows its upper edge wholly straight at 2-, started to be bent,;by the convex incline at -3, bent at merging into a horizontal plane flange-turn- -4 to form the flange at the rear under ing face, and that in turn merging into a side of the convexity, Where it merges into downwardly curved and concave bending 15 the plane face, at 5 startedito bend downface, merging into a vertical-plane finishing 5 ward onto the mandrel and at 6 as fully face, and an adjustable gage mounted upon bent over and finished. the mandrel plate, in combination.

What I claim as my invention, and desire In witness whereof I have hereunto set my to secure by Letters Patent, is hand this 3d day of August, 1893.

A seam turner comprising a metallic plate CHAS. E. EOKEL. IO and a mandrel and another plate mounted to In presence. of

create a channel between the plates, and hav- 0. W. SMITH, ing an inclined and convex seam-starting face HOWARD P. DENISON. 

